How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________?

Related Mcqs:

1. In non zinc containing dental amalgam alloy the percentage of zinc present is______________?

   A. Less than 0.02%
   B. Less than 0.1%
   C. Less than 0.01%
   D. None of the above

2. Moisture contamination of amalgam can lead to_____________?

   A. Marginal breakdown
   B. Shrinkage
   C. Delayed expansion
   D. increased stresses

3. Advantage of zinc containing amalgam is_______________?

   A. Better handling property
   B. Dimensional Stability
   C. Resistance to creep
   D. Toxicity to pulp and dentin

4. Cause of expansion in zinc containing amalgam is_____________?

   A. Zinc and water
   B. Water
   C. Hydrogen
   D. Nascent oxygen

5. The ADA specification No 1 for composition of amalgam alloy recommends______________?

   A. 65% silver, 32% tin and 3% copper
   B. 49% silver, 32% tin and 19% cooper
   C. 65% silver, 29% tin and 5-6% copper
   D. None of the above

6. Mercury rich condition in a slow setting amalgam alloy system in a resoration in______________?

   A. Accelerated corrosion
   B. Fracture of the restoration
   C. Merginal damage
   D. All of the above

7. Which of the following are characteristic feature of high copper amalgam alloy ?

   A. Low compressive strength
   B. High marginal breakdown
   C. Less marginal #
   D. High creep

8. In amalgam alloy which acts as oxygen scavenger_____________?

   A. Cu
   B. Zn
   C. Pd
   D. Ag

9. Which of the following constituents of amalgam alloy decreases expansion____________?

   A. Copper
   B. Zinc
   C. Silver
   D. Tin

10. The largest component of amalgam alloy is_____________?

    A. Silver
    B. Tin
    C. Zinc
    D. Copper